Double parallel spray bar



Sept. 28, 1943. H. R. ERICKSQN 2,330,568

DOUBLE PARALLEL SPRAY BAR Filed May 7, 1941 s sheets-sheet 1 zven/or Sept. 28, 1943. H. R. ERICKSON DOUBLE PARALLEL SPRAY BAR Filed May 7, 1941 3 Sheets-Sheet 2 .Zn/vena?" Maw v arrzegs Sept. 28, 1943. H. R. ERlcKsoN' DOUBLE PARALLEL SPRAY BAR Filed May 7', 1941 3 Sheets-Sheet 5 rnenea ,sepa es, 1943 UNITED STATES PATENT OFFIC DOUBLE PARALLEL- sPaAY BAR. Henry Erickson, Minneapolis, Minn. Applicaties May 7, 1941, serial No. 392,231

1o claims;

l 'I'his invention relates to road spraying devices and more particularly to improvements in spray bars.

One of the objects of my invention is to provide a spray bar construction which is made up of at least two relatively movable sections wherein the sections in one position thereof are in alignment and serve as a continuous straight bar and wherein one bar section can be swung relative to the other to place the sections parallel to each other in tandem to provide a double spray bar where one section lies beside the other.

A more specic object of the invention is to provide a, central relatively stationary spray bar section and movable sections at each end of the central section, the movable sections being each half the length of the central section and swingable from positions aligned with the central section to positions parallel thereto, whereby one movable section can be swung parallel to half of the central section in order to double the amount of surfacing material on a portion of a strip being sprayed and to spray the remainder of the strip with an ordinary normal application.v

A further object of the invention is to provide a spray bar as set forth above which is constructed to circulate liquid from an inlet conduit throughout the entire lengths of all sections of the spray bar and to return the liquids or at least a portion thereof to a common outlet conduit and also to provide means for permitting such circulation regardless of the position to which either of the movable sections is swung.

Another object of the invention is to provide a spray bar of the type set forth in the preceding paragraph with spray outlet valve controls permitting opening or closing of the valves in each section and in different portions of the central stationary section regardless of the positions of the movable sections.

Still a further object of the invention is to provide a movable connection between the stationary section and a movable section which is oiiset from said sections when they are aligned and which permits circulation of liquid through said connection at all times regardless of the position to which the movable section is set.

Another object of the invention is to provide means for balancing.pressures in various parts of the spray bar to insure uniformity of discharge through various discharge outlets.

t Still a further object of the invention is to provide valved spray outlets wherein the valves are effectively prevented from freezing, and wherein 66 the valves are so constructed as to increase ease of operation thereof.

Another object of theinvention is to provide means for introducing emulsied liquids to the spray bar which will prevent the emulsion from separating when a supply tank has been emptied and a new supply is thereafter directed to the spray bar.

These and other objects and advantages of the invention will more fully appear from the following description made in connection with the accompanying drawings, wherein like reference characters refer to the same parts throughout the views, and, in which:

Fig. 1 is a. more or less diagrammatic rear elevation of a wheeled vehicle having my road spraying apparatus mounted thereon;

Fig. 2 is a plan view of my improved spray bar assembly showing alternate full line positions of the movable sections and intermediate dotted line positions of one of said sections;

Fig. 3 is a fragmentary longitudinal vertical section through approximately half of a spray bar assembly;

Fig. 4 is' an enlarged transverse section through a portion of the spray bar Fig. 5 is an enlarged vertical section through the transfer turret connecting relatively movable sections and taken approximately on the line 5-5 of Fig. 2;

Fig. 6 is an enlarged section taken approximately on ,the linel 6 6 of Fig. 2;

Figs. 7 and 8 are horizontal sections through the uid transfer turret and taken approximately at the levels indicated by lines 1-1 and 48 8 in Fig. 6; however, the assembly in Fig. 6 shows the spray bar sections parallel whereas in Figs. 7 and 8, said sections are moved into longitudinal alignment; and

Fig. 9 is a more or less diagrammatic view through a portion of the uid transfer turret takenapproximately on the line 9--9 of Fig. 2.

In Fig. 1 there is shown a vehicle having wheels III anda frame II. A liquid supply tank I2 is supported by the frame I I and said tank has a spray bar inlet pipe I3 and a spray bar outlet pipe I4 connected thereto. The pipe I3 has a suitable liquid pump I5 connected therein as well as an adjustable flow valve I 6; The spray bar outlet pipe Il has a control valve Il connected therein and the portion Ila of said outlet pipe l lies around the spray bar trically thereto.

The spray bar proper includes a central rela.- tively stationary section I8 anda pair of relainlet pipe I3 concentively movable sections I9. Said central spray bar section I9 has an opening 29 formed in its central upper portion and the spray bar outlet pipe I4a communicates with the upper inner portion of said central spray bar section I9, as best shown in Fig. 3. Extending longitudinally of the interior of the spray bar section I3 is a transverse partition 2I which divides the spray bar into a lower inlet chamber 22 and an upper outlet chamber 23.4 'I'he spray bar inlet pipe I3 extends through the partition 2| and terminates in the spray bar inlet chamber 22. There is nol communication between the spray bar inlet pipe I3 and the upper outlet chamber 23. Ii desired, a sump 24 with a drain plug 24a may be provided below the spray bar inlet pipe I3 in the lower central portion oi the spray bar section I8.

Each of the movable spray bar sections I9 is provided with a longitudinal partition 2Ia which divides said movable sections into lower inlet chambers 22a and upper outlet chambers 23a. The partition 2 la as will be seen in Fig. 3 terminates short of the end cap I9a to permit the ow of liquid around the end of partition 2Ia to the upper outlet chamber 23a.

The central spray bar section I 8 and its mov- .able sections I9 are provided with a plurality of outlet nozzles 25 which, as best shown in Fig. 4, are threaded into sleeves 26 which extend upwardly from the bottoms o! said sections through the longitudinal partition 2| to the upper spray bar outlet chamber 23. (Fig. 4 is described as applied to the c'entral spray bar section I8 but is also typical of one of the movable sections I9.)

The sleeve 26 has a branch 21 within which is formed a frusto-conical bore 28, the latter receiving a frusto-conical valve core 29. 'Ihe core 29 is retained by a combined spacer sleeve and washer 39 and nut 3| which lie around a valve core rod 32. Each of the rods 32 carries a lever 33 which is pivotally connected at 34 to an elongated valve operating rod 35.

A feature of the spray outlet valves should be noted. The valve cores 29, as best shown in Fig. 4, have their smaller ends exposed to liquid under pressure in the lower chambers of the spray bar sections. This produces an endwise thrust upon said cores 29 tending to press them toward the larger ends of the valve casing bores 28. Consequently, the cores 29 will not tend to 1am in said frusto-conical bores 28 and the valves will at all times operate with greater freedom.

'I'here is a valve operating rod 35 for each of the movable spray bar sections I9. The central spray bar section I8 has two such operating rods 35, each of which isconnected to a group of half of the spray outlet valves in said central section. Each of said central bar section operating rods 35 has a rod 36 connected thereto by a universal joint 31 and the opposite end of the rod 36 is connected by a universal connection 39 to a lever 39. Lever 39 is mounted for rotation with a vertical shaft 49 which, as best indicated in Figs. 1 and 3, rises upwardly and has a manual operating handle 4I connected thereto, said handle being located conveniently adjacent the rear portion of the liquid supply tank I2 on the vehicle.

The movable spray bar sections I9 each have their valve operating rods 35 connected by universal joints 42 to links 43, and the opposite end of each of said links 43 is connected by a universal joint 44 to a flexible cable 45. 'I'he ilexthected by a universal Joint 41 to a link 43 which in turn is connected to a lever 49 mounted for movement with a vertically disposed shaft 59 similar to the shaft 49 previously described. On the upper end of the vertical shaft 59 is a hand operated lever 5I. Mounted adjacent the ends o! the central spray bar section I8 and also upon the movable sections I9 are flexible cable guides 52 adjacent the ends of each of the cables 45.

In Fig. 5 there is shown a liquid transfer turret T which permits the ilow of liquid from one spray bar section to the other and return and which also provides a pivotal connection between the stationary central spray bar section I9 and the movable sections I9. 'I'he outer ends of the central spray bar section I8 are provided with rearwardly extending lower offset conduits 53. Liquid flows from the inlet pipe I3 into the lower central spray bar chamber I8 and thence into the oiset 53. The ilw from the offset thence Sces rearwardly, as viewed in Fig. 5, past the walls 54 and 55 and upwardly into the central chamber 56 formed in the sleeve-like member 51, which has a partition 58 forming chamber 56 and an upper chamber 59. The liquid then ilows downwardly through a collar 69 out of the lower cage 6I to a lateral oiset conduit 62 which is connected to the movable spray bar section I9 and has flow communication with the lower chamber 22a. It will be seen that the arrow leading from the passage 53 to the chamber 56 is dotted intermediate its ends. VThis indicates that the liquid iiows upwardly and to the rear of that structure through which the dotted line passes. there being an opening provided for such ilow.

After the liquid has traveled to the end of a movable section I9 through the chamber 22a it returns through the chamber 23a to an oset conduit 62a and thence through the upper cage 6Ia to the upper portion 59 of the sleeve-like member 51. From the chamber 59 the flow is as indicated by the upper arrow with a central dotted portion, said dotted portion indicating ilow upwardly and behind the structure through which it passes. This brings the liquid to the upper left-hand oiset conduit 53a from whence it flows to the upper iluid outlet chamber 23 in the main spray bar section I8.

Figs. '1 and 8 which are taken approximately on the lines 1-1 and 8-8 of Fig. 6 (the spray bar sections being parallel in Fig. 6 and opened up into alignment in Figs. 7 and 8) show certain portions of the turret iiow conduits. The stationary spray bar sections are shown at I8, and in Fig. 8 the upper spray bar outlet chamber 23 is shown. The movable spray bar sections I9 are illustrated.

As best indicated in Fig. 9 the sleeve-like member 51 is a portion of the casting which includes the offset conduits 53 and 53a. 'I'he sleeve-like member 51 has an opening 63 which is the opening through which the liquid ilows from the oil?- set 53 t0 the chamber 56 and said sleeve-like member has an opening l63a through which liquid flows from the chamber 59 to the upper ofiset conduit 53a. This is the .ilow indicated by the partially dotted arrows of Fig. 5. The openings 64 and 64a are openings through the walls 54 and 54a which together with the open cages 6I and 6Ia permit the ow of liquidv into and out of said cages.

Referring back -to Figs. 7 and 8 there is shown the upper oiset conduit 53a connected to the stationary bar section I8 and the offset conduit 62a which is in communication with the movable spray bar sections I9.

en the device is assembled the casting comprising the odset conduits 53, 53a and its attached sleeve portion receive extensions of odset conduits 82. 62a above and below saidV sleeve-like portion 51. The collars 60 and 60a are threaded into the ends of the sleeve 51 and packing rings 65 are then placed in position. Against these packing rings are placed the inner edges of the cages 6l and Gla. The caps 66 are then threaded into suitable threaded openings in the casting which includes the o lset conduits 62 and 62a. 'I'he nutted bolts 61 are threaded through the caps 66 to permit pressing of the two cages 6| and Gia against the packing rings 65. Lock nuts 68 secure the bolts 61 in position. The upper bolt 6l, as shown in Fig. 5, carries a small shouldered stud 69 beneath the head of which is positioned a swivel member 10. The member 'I0 serves as a support for the intermediate portion of the iiexible cable 45 connected between the main spray bar section I 8 and the movable section I9.

Because of the fact that the spray bar outlet nozzles 25 communicate with the upper or fluid return chambers 23 and 23a of the spray bar sections and partially obstruct the uid inlet chambers 22 and 22a there might be suiiicient drop in pressure adjacent the beginning of the uid Vreturn pipe Ila to aiect the evenness of distribution of surfacing material and if such a drop took place there would be less liquid issuing from the nozzles-adjacent the center of the central spray bar section than at the outer ends of the movable sections. For this reason I have connected a pipe Il between the lower main bar section inlet chamber 22 adjacent the lower end of the iiuid supply pipe I3 and have connected the other end of the pipe II with the upper main spray bar chamber 23 at a point preferably adjacent the outer end of said section I8. Thus pressure is transmitted nearly directly to the upper main spray bar chamber 23 to supplement any drop in pressure occasioned by the travel of the liquid through the iluid transfer turret and pivot. and to the end of each movable sectionits past and around all of the outlet sleeves 26. The pipe 'Il has a iiow control valve l2 positioned therein.

Connected 'to the vertical spray bar return pipe Ila is a bracket 13 having a substantially horizontal portion 13a upon which the ends of the movable spray bar sections I9 may rest when they are swung in in the manner shown at the left-hand side of Fig. 2. When said movable sections I9 are swung out into alignment With the central spray bar section I8, as shown in the right-hand side of Fig. 2, a pivoted spring pressed lever 14 snaps over a catch 'I5 to keep the movable section I9 in its aligned position.

When the pump I5 is actuated to supply liquid from the tank I2 to the fluid supply line I3, said uid is conveyed to the lower chamber of the main spray bar portion I8 and thence in opposite directions to the ends of the main spray bar section I8. From there the uid passes through the iuid transfer turret and pivot T to the lower chambers 22a of the movable spray bar sections I9. After passing around the ends of the partitions 2Ia in said movable spray bar sections the fluid is directed toward the center of the central spray bar section. In its passage liquid is supplied to the various valved spray outlets and nozzles 25 and a portion of this ilow is carried through the upper half of the liquid transfer turret T to the upper or return chamber 23 of the main spray bar section i8. From there the excess liquid passes up the vertical return pipe Illa to the tank I2. A

It should be noted that regardless of the positions to which the movable spray bar sections I9 are swung the spray outlet valves in said movable sections can be opened or closed. These outlet valves in the main spray bar section I8 are divided into two groups which can also be opened or closed at will. With the apparatus in the position shown in full lines in Fig. 2 it will be possible when spraying a road to spray a double quantity of liquid along a portion of the road such as adjacent the shoulder and simultaneously produce a normal spray throughout the remainder of the spray bar unit.

The pump I5 may be considered as being any suitable type of reversible pump or if a reversible valve is used in the supply line I3 liquid may be reversed in the distributing system and in that event the spray bar can be emptied to the point Where'the upper chambers 23 and 23a in the spray bar sections are empty, thus preventing the dripping of surfacing uid from the spray outlets and still the lower chambers 22 and 22a in said spray bar sections may remain comparatively full. In the use of asphaltic emulsions and the like it is desirable, of course, that the emulsion not be broken down. If the tank should need reiilling the upper chambers of the spray bar sections could be emptied by reversing the ilow and when the tank has been refilled the flow can be again directed downwardly through the supply pipe I3 and there is little likelihood of breaking down the emulsion. 'I'his is due to the fact that the emulsion is not agitated to any appreciable extent as it would be ii it were pumped into a completely empty spra-y bar.

It will, of course, be understood that various changes may be made in the form, details, arrangement and proportions of the various parts without departing from the scope of my inven- What is claimed is:

1. In road spraying apparatus and the like, a relatively stationary spray bar section, a relatively movable spray bar section, said spray bar sections being longitudinally divided to provide inlet and outlet chambers therein, a pivot element lconnecting said spray bar sections, and said pivot element having a pair of iluid conduits therein. one of said conduits being in communication with the inlet chambers of said spray bar sections in all positions of said relatively movable section, and said pivot element having a iiuid conduit therein in communication with said outlet chambers in all positions of said relatively movable spray bar section.

2. In road spraying apparatus and the like, a spray bar having an inlet chamber and an outlet chamber, a iluid supply connection with said inlet chamber, said chambers having ow communication at a point remote from said supply inlet, said outlet chamber having a return connectionv communicating therewith' at a point remote from the communication between said i chambers, said spray bar having spray nozzles communicating with said outlet chamber, and pressure equalizing means in said chambers comprising a conduit connecting said inlet chamber with said outlet chamber at a point spaced from said rst mentioned communication between said chambers.

3. The structure in claim 2 and said pressure equalizing means providing iiow communication between said inlet 'chamber and said outlet chamber at a point between the outlet connection of said outlet chamber and the ilrst mentioned point of communication between said chambers.

4. The structure in claim 2 and said pressure balancing means comprising a conduit extending from said inlet chamber to said outlet chamber at a point adjacent the outlet connection of said outlet chamber.

5. In road spraying apparatus and the like, a spray bar having a iiuid inlet and an outlet, a plurality of spray nozzles at spaced points along said spray bar between said inlet and outlet, and a pressure balancingv iiuid inlet conduit connected to said spray bar between said ilrst mentioned iiuid inlet and said outlet.

6. 'I'he structure in claim 5 and said pressure balancing uid inlet conduit being connected t said spray bar adjacent said outlet.

7. In road spraying apparatus and the like, a longitudinally divided relative stationary spray bar section having aninlet chamber and an outlet chamber in iiuid ow communication, a longitudinally divided relatively movable spray bar section having an inlet chamber and an outlet chamber in flow communication. said inlet chamber being in ow communication and said outlet chambers being in flow communication with each other, said relatively movable section in one position, being substantially in longitudinal alignment with said relatively stationary'section, and in another position, said relatively movable spray bar section lying substantially parallel to said relatively stationary section.

8. The structure in claim 7 and the flow communication between said inlet chambers and the ow communication between said outlet chambers being maintained in both positions of said spray bar sections.

9. The structure in claim 7 and said spray bar sections having outlets therein, valves controlling the ow through said outlets. and a common actuator for the valves in said relatively movable section, said actuator being movable in both positions of said relatively movable spray bar section.

10. In a road spraying apparatus and the like, an elongated spray bar section, a iluid inlet conduit connected to said spray bar section and adapted to convey fluid to said spray bar section, said spray bar section having a return conduit. and a bypass conduit connected to said fluid inlet conduit and also connected to said spray bar section between the points of connection of said inlet conduit and said return conduit with said spray bar section.

HENRY R.. ERICKSON. 

